UISearchController不要将viewcontroller推到UISearchController的下方

Question

自动呈现UISearchController和自己呈现搜索控制器之间的行为有所不同。

@implementation MyViewComtroller

// click search barbutton on right of navigationBar
- (void)searchAction:(id)sender {
    ArticleSearchViewController *searchResultsController = [[ArticleSearchViewController alloc] init];
    UISearchController *searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController];
    searchController.searchResultsUpdater = searchResultsController;
    searchController.searchBar.delegate = searchResultsController;
    searchController.delegate = searchResultsController;
    searchController.hidesNavigationBarDuringPresentation = NO;
    [self presentViewController:searchController animated:YES completion:nil];
}

@end

@implementation ArticleSearchViewController

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    ArticleDetailController * articleDetailController = [ArticleDetailController new];
   [(UINavigationController *)self.presentingViewController pushViewController:articleDetailController animated:YES];
}

@end

推送操作发生在UISearchController下面。

Answer 1

您以错误的方式显示搜索控制器。查看部分文档。

您可以将搜索控制器与现有视图控制器一起使用。当您的视图控制器具有可搜索的内容时，请将UISearchController对象的搜索栏合并到视图控制器的界面中。当用户与该搜索栏交互时，搜索控制器会自动显示一个新的视图控制器以及您指定的搜索结果。

而不是在您的主控制器中：

[self presentViewController:searchController animated:YES completion:nil]; 

您应该在iOS 11上执行此操作：

self.definesPresentationContext = YES;
self.navigationItem.searchController = searchController;

或者在iOS 11之前的版本中：

self.definesPresentationContext = YES;
self.navigationItem.titleView = searchController.searchBar;

或searchController.searchBar在显示的视图层次结构中放置其他任何位置。

您还应该将搜索控制器设置在类似viewDidLoad而不是按下按钮的地方。

而你得到你一个参考的方式navigationController中ArticleSearchViewController必须进行更新，以这样的：

[self.presentingViewController.navigationController pushViewController:articleDetailController animated:YES];

具有可搜索内容的View Controller：

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor blackColor]];

    UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    ArticleSearchViewController *searchResultsController = [sb instantiateViewControllerWithIdentifier:@"ArticleSearchViewController"];
    UISearchController *searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController];
    searchController.searchResultsUpdater = searchResultsController;
    searchController.searchBar.delegate = searchResultsController;
    searchController.delegate = searchResultsController;
    searchController.hidesNavigationBarDuringPresentation = NO;
//    [self presentViewController:searchController animated:YES completion:nil]; //WRONG
    self.definesPresentationContext = YES;
    self.navigationItem.searchController = searchController;
}

@end

结果控制器：

@implementation ArticleSearchViewController

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    UIViewController * articleDetailController = [UIViewController new];
    [self.presentingViewController.navigationController pushViewController:articleDetailController animated:YES];
}

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {
    // update appropriately
}

@end